126206505 has 40 divisors (see below), whose sum is σ = 231530112. Its totient is φ = 65735712.

The previous prime is 126206501. The next prime is 126206513. The reversal of 126206505 is 505602621.

126206505 is a `hidden beast` number, since 1 + 2 + 6 + 2 + 0 + 650 + 5 = 666.

It is not a de Polignac number, because 126206505 - 2² = 126206501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126206501) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13792 + ... + 21038.

Almost surely, 2^126206505 is an apocalyptic number.

126206505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126206505 is a deficient number, since it is larger than the sum of its proper divisors (105323607).

126206505 is an equidigital number, since it uses as much as digits as its factorization.

126206505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307 (or 7298 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 126206505 is about 11234.1668582944. The cubic root of 126206505 is about 501.6035252494.

The spelling of 126206505 in words is "one hundred twenty-six million, two hundred six thousand, five hundred five".